18312823 has 4 divisors (see below), whose sum is σ = 18328320. Its totient is φ = 18297328.

The previous prime is 18312821. The next prime is 18312841. The reversal of 18312823 is 32821381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18312823 - 2¹ = 18312821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18312791 and 18312800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5815 + ... + 8392.

It is an arithmetic number, because the mean of its divisors is an integer number (4582080).

Almost surely, 2^18312823 is an apocalyptic number.

18312823 is a deficient number, since it is larger than the sum of its proper divisors (15497).

18312823 is a wasteful number, since it uses less digits than its factorization.

18312823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15496.

The product of its digits is 2304, while the sum is 28.

The square root of 18312823 is about 4279.3484317125. The cubic root of 18312823 is about 263.5836287453.

The spelling of 18312823 in words is "eighteen million, three hundred twelve thousand, eight hundred twenty-three".